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Diffstat (limited to 'net/ipv4/tcp_scalable.c')
-rw-r--r--net/ipv4/tcp_scalable.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/net/ipv4/tcp_scalable.c b/net/ipv4/tcp_scalable.c
index bf5ea9e9bbc1..f2123075ce6e 100644
--- a/net/ipv4/tcp_scalable.c
+++ b/net/ipv4/tcp_scalable.c
@@ -15,6 +15,10 @@
#define TCP_SCALABLE_AI_CNT 50U
#define TCP_SCALABLE_MD_SCALE 3
+struct scalable {
+ u32 loss_cwnd;
+};
+
static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 acked)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -32,12 +36,23 @@ static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 acked)
static u32 tcp_scalable_ssthresh(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
+ struct scalable *ca = inet_csk_ca(sk);
+
+ ca->loss_cwnd = tp->snd_cwnd;
return max(tp->snd_cwnd - (tp->snd_cwnd>>TCP_SCALABLE_MD_SCALE), 2U);
}
+static u32 tcp_scalable_cwnd_undo(struct sock *sk)
+{
+ const struct scalable *ca = inet_csk_ca(sk);
+
+ return max(tcp_sk(sk)->snd_cwnd, ca->loss_cwnd);
+}
+
static struct tcp_congestion_ops tcp_scalable __read_mostly = {
.ssthresh = tcp_scalable_ssthresh,
+ .undo_cwnd = tcp_scalable_cwnd_undo,
.cong_avoid = tcp_scalable_cong_avoid,
.owner = THIS_MODULE,